Mondo Knows Games
Eight Queens
The oldest puzzle in chess: fit eight queens on an eight by eight board so that no two share a row, a column or a diagonal. The board shades every square a placed queen attacks, so the shape of the problem is visible as you work it out. It is a hard game that takes 2-10 minutes, controlled with mouse or tap on a square.
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How to play
- Tap an empty square to place a queen there.
- Rows, columns and diagonals covered by a queen are shaded, so they are where the next queen cannot go.
- A queen sitting in another queen's line is flagged in red.
- Place all eight with no clashes to solve it.
Controls
Mouse or tap on a square. Undo takes the last queen off.
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Questions people ask
- How do you play Eight Queens?
- Tap an empty square to place a queen there. Rows, columns and diagonals covered by a queen are shaded, so they are where the next queen cannot go. A queen sitting in another queen's line is flagged in red. Mouse or tap on a square. Undo takes the last queen off.
- Is Eight Queens free to play?
- Yes. Eight Queens runs in the browser for nothing: no download, no account and no sign-up. Eight Queens sits on the Puzzle shelf at Mondo Knows, alongside puzzle and chess games.
- How long does a game of Eight Queens take?
- 2-10 minutes. It is rated hard, and mouse or tap on a square. Undo takes the last queen off. Your best score stays on your own device.
- Does Eight Queens work on a phone?
- Yes. The board sizes itself to the screen, so Eight Queens plays the same on a phone as on a desktop, and touch controls replace the mouse. Nothing needs installing.
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Everything runs in your browser. Scores and bests are stored on your own device, not on a server.